Synthesis and thermoluminescence of Ce-doped CaF2 phosphor: Study of defect centers responsible for the TL emission by EPR analysis

Joel A. Rivera-García, Jessica Mosqueira-Yauri, T. K. Gundu Rao, Edwar A. Canaza-Mamani, Giovanni G Fiorini, J. F. Benavente, Carlos D Gonzales-Lorenzo, José F D Chubaci, Shigueo Watanabe, Jorge S. Ayala-Arenas, Nilo F. Cano

Research output: Contribution to journalArticlepeer-review


We present here the thermoluminescence (TL) properties of Ce-doped CaF2 (CaF2:Ce) phosphor synthesized by combustion of the precipitate formed from the addition of NH4F to (Ca(NO3)2)⋅4H2O. The structure analysis of the synthesized sample was carried out by X-ray diffraction (XRD) technique. The CaF2:Ce phosphor shows an intense peak at about 120 °C and a low-intensity peak at 280 °C. Both peaks' thermoluminescence (TL) intensity was observed to increase with γ-dose. The kinetic parameters of TL peaks were calculated for CaF2:Ce phosphor using the Tm-Tstop and deconvolution methods. Electron paramagnetic resonance (EPR) is utilized to identify the defect centers formed in γ-irradiated CaF2:Ce phosphor and also to infer the defect centers involved in the TL process. The presence of two defect centers is inferred and center I has a g-value equal to 2.018 and is identified as an O ion. The O ion correlates with the TL peak at 120 °C. Center II with a g-value of 2.0057 is ascribed to a radiation-induced Fe3+ ion and is observed to relate to the high-temperature TL peak at 280 °C. The UV–Vis optical absorption of pure CaF2 and Ce-doped phosphors was investigated.

Original languageEnglish
Article number119906
JournalJournal of Luminescence
StatePublished - Sep 2023

Bibliographical note

Funding Information:
This work was supported by “Universidad Nacional de San Agustín de Arequipa” (Process number IBAIB-02-2018-UNSA). We are grateful to Dr. B.C. Bhatt, ex Bhabha Atomic Research Center, Mumbai, India for his suggestions. The authors would like to express our thanks to Ms. E. Somessari from the Institute for Energy and Nuclear Researches (IPEN), Brazil, for kindly carrying out the gamma irradiation of the samples for the EPR measurements.

Publisher Copyright:
© 2023 Elsevier B.V.


  • Calcium fluoride
  • Defect centers
  • EPR
  • TL


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